Centrifugal pump



ec. i9 1922.

J, S. HAZELL. CENTRIFUGAL PUMP,

Fl LED MAR, 12. 192i maand Dec. '19, l1922.

UNITED sTATEsfPATENr OFFICE.

JOHN STANLEY HAZELL, OF FOREST GATE, LONDON, ENGLAND, ASSIGNOR TOUNCHOKEABLE PUMP LIMITED, OF LONDON,4 ENGLAND.

CENTRIFUGAL PUMP.

Application led March 12, 1921. Serial No. 451,680.

To all whom it may concern:

Be` it known that I, JOHN STANLEY HAznLL, a subject of the King of GreatBritain, residing in Forest (irate,'London,

England, have invented certain new and useful Improvements in andrelatlngto` Centrifugal Pumps, of which the following is aspecification.

This invention relates to ,improvements 1n and relating to centrifugalpumps and it refers particularly to pumps in which the impeller isprovided with a single. port or opening for the passage of the liquld."

The present invention has for its pr1mary ob`ect certain improvements inpumps of thls type/designed to increase the efliciency thereof byreducing slip l The inventionfurther provides improvements enabling thepum to operate effectively When driven in eit er direction.

' Accordin to this invention in order to avoid slip the passage in theim elle-r at the discharge end thereof is provi ed with one or moreradially disposed vanes or projections, or instead of projections thesurface of the passage at th1s point may be corrugated or otherwiseshaped or treated to increase the grip upon the liquid.

In order that the invention ymay be the 30. better understood drawingsare appended.A

illustrating the application of the invention to a pump having animpeller of the single passage type.

In the accompanying drawings tudinally of the shaft of the impeller,

Fig. 2 is a section on line A A Fig. 1. Referring to the accompanyingdrawings a .indicates the shaft of the impeller and b 40 the impeller.

Arranged as shown within the port or passage d are vanes or projectionse which are disposed upon opposite sides of the passage and are curved'at the ends directed Fig. l is a vertical section taken longitowards theincoming liquid, as shown, thereby preventing solid or fibrous materialfrom being caught and retained by said Vanes. The vanes are of suchwidth as to leave a clear passage or space between them for the readypassage of the material. The vanes or other projections may be radiallydlsposed or they may be radially inclined as shown in Fig. 2. The vanesor the like may be opposite one another as shown or the may bestaggered.

l here the pump is to be driven in one direction only the vanes may becurved lon gitudinally or provided with curved inner surfaces.

Claims:

1. A centrifugal pump Comprising an outer case, an inlet to said case,an out-` let from said case, an impeller having a single port forthepassage of the liquid, projections upon each side of the surface of thepassage at the discharge end thereof.

2. A `centrifugal pump comprising an outer case, an inlet to said case,an outlet from said case, an impeller having a single. port for thepassage of the liquid and inclined projections upon each side of thepassage at the discharge end thereof. l 3. A centrifugal pump comprisingan outer case, an inlet to said case, an voutlet from said case, animpeller having a single port for the passage of the liquid, projectionsupon each side of the surface of the passage lat the discharge endthereof, the projections upon one side being arranged in staggeredrelationship to those upon the other side. L

In testimony whereof I have hereunto set my hand in the-presence of twowitnesses.

JOI-IN STANLEY HAZELL.

lWitnesses: PERCY W. Cox,

EDMUND H. HARBERD.

